Rock-drill centralizer



April 1 1924. 1,488,554

' c. v. PLUMB ROCK DRILL CENTRALIZER Original Filed Nov. 19. 1921 I X u "ifimunuu .Patented Apr. 1, 1924.

UNITED STATES PATENT OFFICE.

CLARENCE V. PLUHB, 015 L08 ANGELFS, CALIFORNIA, ASSIGNOR TOINGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ROCK-DRILL CENTRALIZER.

Application filed November 19, 1921, SerialNo. 516,442. Renewed November 8; 1928:

To all whom it may concern a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a Rock-DrillCentralizer, of which the following is a specification accompanied by draw- I ings.

This invention relates to rock drills of the hammer type but more particularly to a combined supporti bearing and do or centralizer for the rill steel. The objects of this invention are to produce a relatively simple, practical and efficient structure that may be easily and quickl applied to or removed from the shell a rock drill and which will serve to rigidly support the drill steel upon starting a hole.

A further object of my invention is to produce a combined support and guide that will greatly facilitate the starting of drill holes and particularly Where the drill hole is to be formed on an angle in the face of a wall.

Further objects of the invention will here inafter appear, and the invention consists in certain features of construction, arrangement of parts and combination of elements, and the invention is shown in one of its referred forms in the accompanying drawings in which;

Fig. 1 is a top lan view of the forward end of the shell 0 a rock drill and showing my improved guide and support positioned thereupon,

Fig. 2 is a side elevational view of the guide and support in position for use,

7 Fig. 3. is an enlarged cross section taken on the line 3-3 of Fig. 2,

Fig. 4 is a perspective view of the bearing block for the drill shank,

Fig. 5 is a perspective view of the forward ends of the arms that support the drill shank bearing block, and

Fig. 6 is an enlar cross section taken on the line 6-6 of Fig. 1.

Referring by numerals to the accompanying drawing, which illustrates a practical embodiment of my invention, 10 designates the shell of a rock drill in the sides of which .are formed channels or guide-ways 11. My improved supporting bearing includes a pair of arms 12 and 13 having straight shanks at their rear ends 14 and said shanks are adapted to be positioned in the guide-ways shell.

1 11, when the device is applied to the drill. Be it known that I, CLARENCE V. PLUMB,

The rear ends of the arms are adapted to frictionally grip the guidew'ays 11 of the The forward end of arm 12 is horizontally slotted to form a between which is ositione a plate 16 that is formed on the orward end of arm 13.

The plates 15 and 16 are provided with pair of plates 15 vertically aligned apertures 17 and the upper one of plates 15 is rovided with notches 18 on opposite sides 0 the aperture in said plate.

Passing through an aperture 19 in the central portion of arm 12 is a rod 20 having a threaded end portion 21, that is seated in a threaded aperture in arm 13. The rear end of rod 20 is provided with a hand wheel 21 and secured to said rod adjacent to arm 12 is a collar or flange22. As a result of the construction just described when rod 20 is rotated the arms 12 and 13 will be drawn toward or moved away from eachother.

A plate 23 is provided on top of its end portions with oppositely arranged lugs 24 which preferably extend at substantially right angles from the arms 12 and 13 and in the inner faces of which are formed bearings 25 for the drill steel 26, and which latter is carried by the usual chuck 27.

Depending from the center of plate 23 is a pivot pin 28 that passes through they notches 18. By virtue of this construction when arms 12 and 13 are moved toward or away from each other, plate 23' will be slightly rotated owing to the arrangement of lugs 30in notches 18. The lugs 24 are positioned on plate 23 so that when the arms 12 and 13 are moved toward each other, said lugs 24 having the bearings 25, will move away, from drill steel 26 so that the combined support and'bearing may be readil detaiched from the rock drill shell and dri stee The arms 12 and 13 are adapted to be held in the guideways of the shellin a lane substantially parallel to theplane o the shell guideways and may extendbeyond the end of the shell in order that a steel of com siderable length may be guided and snpp0rted thereby. After the drill has been moved forwardly in the shell a suficient distance to enable the forward end to come in contact with the rear lug 24: of the centralizer, further movement of the drill will force the arms from their engagement with the shell.

A device of my improved construction is comparatively simple, may be easily applied to or removed from the shell of a rock drill,

1. In a rock drill, the combination with a shell, of a centralizer for guiding the drill steel, and means for causing said centralizer to frictionally grip said shell, tending to hold said centralizer stationary relative to said Shell.

2. In a rock drill, the combination with a shell, of a centralizer for guiding the drill steel, and means for frictio'nally holding said centralizer on the shell, said centralizer min adapted to be forced from said shell by to forward end of the rock drill.

3. A combined support and guide fordrill steels comprising a pair of pivotall connected arms, means for moving sai arms toward and away from each other, a member supported by the ivotally connected ends of said arms an; bearings on said member for a drill steel.

4. In a rock drill steel guide, a pair of arms pivotally connected at one end, a member supported by the pivotally connected ends of said arms and connect to one arm so as to move therewith and drill steel bearings on said member.

5. The combination with a rock drill and its shell of a pair of pivotally connected arms detachably secured to the shell of the drill and a pair of drill steel bearings sup ported by'said arms.

6. The combination with a rock drill and its shell, of a pair of pivotally connected arms removably applied to the shell of the drill, a plate supported by said arms and connected to one arm so as to move therewith and a pair of drill steel bearing lugs on said plate.

7. In a rock drill, the combination of a shell having guidewa s, a pair of arms adapted to be trictionallly held in said guideways, a plate supported by said arms, and oppositely arranged lugs on said plate for guiding and supporting a drill steel, said arms being adapted to be forced completely from said guideways by the forward end of the rock drill.

8. In a rock drill, the combination of a shell having guideways, a pair of ivotally connected arms adapted to extenf beyond the end of said shell and lie in a lane sub stantially parallel to the plane-o the shell guideways, manual means for causingsaid arms to be frictionally held in said guideways, a late supported by said arms and connecte to one said arms to move there with, and oppositely arranged lugs carried by said plate for supporting and guiding a drill steel. 

